October 31, 2022 to November 4, 2022
Europe/Zurich timezone

Coscattering in micrOMEGAs: LLP implications in the singlet-triplet dark matter model

Nov 4, 2022, 3:10 PM



Gael Alguero


In scenarios with very small dark matter (DM) couplings and small mass splittings between the DM and other dark-sector particles, so-called "coscattering" or "conversion-driven freeze-out" can be the dominant mechanism for DM production. They hence also tend to feature long-lived dark-sector particles with longer lifetimes than in the well-known coannihilation case. In this talk, we present the inclusion of this mechanism in micrOMEGAs together with a case study of the phenomenological implications in the singlet-triplet model. We observe that coscattering is needed to describe the thermal behaviour of the DM for very small couplings and it opens up a new region in the parameter space of the model. Long-lived particle constraints from the LHC, evaluated with SModelS, are found to exclude a large part of this region, up to DM masses of about 500 GeV for the smallest lifetimes considered.

Primary authors

Alexander Pukhov (SINP, MSU) Gael Alguero Genevieve Belanger Sabine Kraml (LPSC Grenoble)

Presentation materials